Jump to main content
Jump to site search

Issue 15, 2018
Previous Article Next Article

Room-temperature ferromagnetism in Ni(II)-chromia based core–shell nanoparticles: experiment and first principles calculations

Author affiliations

Abstract

We have synthesized bimagnetic core–shell nanoparticles containing a first-of-its-kind Ni(II)-chromia nanophase shell and a well-defined, epitaxial core–shell interface. Magnetic measurements reveal a substantial coercivity of the nanoparticles and a significant exchange bias effect between the antiferromagnetic chromia core and the ferromagnetic Ni(II)-chromia shell at low temperatures. The ferromagnetism and a weak exchange bias effect are found to persist to room temperature in the core–shell nanoparticles of ∼57 nm average size. Our first principles Density Functional Theory (DFT) calculations confirm that the novel corundum-structured Ni(II)-chromia phase has an equilibrium cluster-localized ferromagnetic spin configuration. In addition, the DFT-based calculations show that the Ni(II)-chromia phase is a Mott–Hubbard insulator, with a narrowed energy band gap and increased covalent bonding due to strong hybridization between Ni 3d and O 2p levels in the upper portion of the valence band and within the band gap region. The antiferromagnetic, ferromagnetic and magnetoelectric properties of our core–shell nanoparticles make these well suited for patterned recording media and biomedical applications.

Graphical abstract: Room-temperature ferromagnetism in Ni(ii)-chromia based core–shell nanoparticles: experiment and first principles calculations

Back to tab navigation

Supplementary files

Publication details

The article was received on 24 Dec 2017, accepted on 25 Mar 2018 and first published on 26 Mar 2018


Article type: Paper
DOI: 10.1039/C7CP08597D
Citation: Phys. Chem. Chem. Phys., 2018,20, 10396-10406
  •   Request permissions

    Room-temperature ferromagnetism in Ni(II)-chromia based core–shell nanoparticles: experiment and first principles calculations

    M. D. Hossain, R. A. Mayanovic, S. Dey, R. Sakidja and M. Benamara, Phys. Chem. Chem. Phys., 2018, 20, 10396
    DOI: 10.1039/C7CP08597D

Search articles by author

Spotlight

Advertisements